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AIIMS MD MS EE
(Single Best Answer) Question 1911: Which of the following combinations of biologically active molecules does Vitamin A consist of ?
A) Retinol, retinal and retinoic acid
B) Retinol, retinal and tetrahydrofolate
C) Retinol, conjugase and retinoic acid
D) PABA, retinal and retinaldehyde
Answer (Select an option above to get the answer):
(Single Best Answer) Question 1912: The primary structure of a protein refers to the ?
A) Linear number and order of the amino acids present
B) Regular conformational forms of a protein
C) Complete three-dimensional structure of the polypeptide units of a given protein
D) Subunit structure of the protein
Answer (Select an option above to get the answer):
(Single Best Answer) Question 1913: Excessive ultraviolet (UV) radiation is harmful to life. The damage caused to the biological systems by ultraviolet radiation is by ?
A) Inhibition of DNA synthesis
B) Formation of thymidine dimers
C) Ionization
D) DNA fragmentation
Answer (Select an option above to get the answer):
(Single Best Answer) Question 1914: Biologiocal role of metalloproteins is to sequester harmful metal ions. These bind ?
A) Cd++, Cu++ & Zn++
B) Al+++, Hg++ & NH4+
C) Pt++, As+++ & PO4-
D) Fe+++, Na+ & K+
Answer (Select an option above to get the answer):
(Single Best Answer) Question 1915: Which one of the following is not true for an alpha-helix ?
A) It is one of the most important secondary structure
B) It has a net dipole moment
C) All hydrogen bonds are aligned in the same direction
D) Long stretches of left handed alpha-helices occur in proteins
Answer (Select an option above to get the answer):
(Single Best Answer) Question 1916: A young boy who was driving motorcycle at a high speed collided with a tree and was thrown on his right shoulder. Though there was no fracture, his right arm was medically rotated and forearm pronated. The following facts concerning this patient are correct, except ?
A) The injury was at Erb's point
B) A lesion of C5 and C6 was present
C) The median and ulnar nerves were affected
D) Supraspinatus, infraspinatus, subclavius and biceps brachii were paralysed
Answer (Select an option above to get the answer):
(Single Best Answer) Question 1917: In a vehicular accident, the musculocutaneous nerve was completely severed, but still the person was able to weakly flex the elbow joint. All of the following muscles are responsible for this flexion, except ?
A) Brachioradialis
B) Flexor carpi radialis
C) Ulnar head of pronator teres
D) Flexor carpi ulnaris
Answer (Select an option above to get the answer):
(Single Best Answer) Question 1918: Misexpression of which of the following homoeobox genes alters the position of the forelimbs during development ?
A) HOXA7
B) HOXB8
C) HOXC9
D) HOXD10
Answer (Select an option above to get the answer):
(Single Best Answer) Question 1919: Which of the following nuclei belongs to the general visceral efferent column ?
A) Facial nerve nucleus
B) Trigeminal motor nucleus
C) Dorsal nucleus of vagus
D) Nucleus ambiguous
Answer (Select an option above to get the answer):
(Single Best Answer) Question 1920: Joint between epiphysis and diaphysis of a long bone is a type of ?
A) Plane synovial joint
B) Fibrous joint
C) Symphysis
D) Synchondrosis
Answer (Select an option above to get the answer):
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